EP3468701B1 - Mixing apparatus, plant and method for mixing materials, in particular pourable materials, and use of the mixing apparatus - Google Patents

Description

The present invention relates to the field of mixing, with preferably pourable and/or particulate materials or starting materials being mixed or converted into a mix or mixture, preferably a mixture.

In particular, the present invention relates to a mixing device for mixing particulate materials, preferably for producing a dry mixture of building materials, in particular a plaster mortar.

Equally, the present invention relates to the use of a mixing device for mixing particulate materials, preferably for producing a mix, preferably a dry mix of building materials, in particular a plaster mortar.

The present invention also relates to a system for producing a mixture, preferably a dry mixture of building materials, in particular a plaster mortar, in which a mixing device for mixing preferably pourable and/or particulate materials is used.

Finally, the present invention relates to a method for mixing preferably pourable and/or particulate materials, preferably for producing a dry mixture of building materials, in particular a plastering mortar.

A mixing device of the type in question is generally suitable for mixing materials to form a material to be mixed or a mixture and/or mixture. In the specific and particularly preferred application, the mixing device relates to the mixing of pourable and/or particulate materials for the production of a dry mixture of building materials, in particular a plastering mortar. Accordingly, the subject of the present invention is also a system for producing a mix or mixture and/or mixture, preferably a dry mix of building materials, in particular a plaster mortar, in which such a mixing device for mixing preferably pourable and/or particulate materials is used.

The prior art and the teaching of the present invention are explained here in connection with the mixing or processing of pourable and/or particulate materials, preferably for the production of a dry mixture of building materials, in particular a plastering mortar. It is noted here, however, that the teaching of the invention is not limited to this single application, although it is preferred.

the DE 40 02 099 A1 discloses a mixing device with a cylindrical mixing container in which a mixing shaft with attached mixing tools for processing or mixing materials is arranged, the mixing container having an inlet opening for introducing or filling in the (starting) materials and an outlet opening for discharging the to a mixture of mixed (starting) materials.

The inlet opening for introducing or filling the materials into the mixing container is at the DE 40 02 099 A1 arranged centrally above the mixing shaft. The disadvantage of this arrangement of the inlet opening, however, is that a high proportion of the materials entering the mixing container via the inlet opening impinge on the mixing shaft or other components arranged in this area, accompanied by a high risk of destruction and/or dissolution and/or or crushing the particulate materials.

In this regard, it should be emphasized that, especially in connection with the production of dry mixes of building materials or plastering mortar based on pourable or particulate starting materials, maintaining dimensional stability during the mixing or production process is an absolutely necessary requirement criterion for achieving the desired product properties of the resulting mix, in particular in terms of thermal conductivity, water vapor diffusion resistance number, compressive strength and/or dry bulk density.

In particular, in the production of dry building material mixes, the problem is often observed that mechanically sensitive, i.e. only slightly resilient, materials are damaged or destroyed when mixed with other building materials in order to obtain a dry building material mix, for example as the basis of a plaster mortar, and their properties are thus damaged in the resulting Building material does not come into play or not to the planned extent. This applies, for example, to silica-based aerogels, which are highly porous solids with excellent thermal insulation properties are. In theoretical terms, aerogels have long been regarded as excellent thermal insulation materials, but their practical use in building materials, especially insulating plasters, has not yet been realized on an industrial scale due to their low mechanical strength.

Against this technical background, the present invention is therefore based on the object of providing an efficient mixing device for processing or mixing preferably pourable and/or particulate materials and a corresponding system and a corresponding method for producing a mixture, preferably a dry mixture of building materials, in particular a plaster mortar, provide, wherein the disadvantages of the prior art described above should be at least largely avoided or at least mitigated.

In particular, one object of the present invention is to provide an efficient mixing device for mixing particulate materials, wherein compared to the prior art at least while maintaining, preferably improving, the mixing efficiency, a material-friendly processing or mixing of the materials, in particular while maintaining the dimensional stability or avoidance of destruction and/or dissolution of the materials.

In this context - according to a further object of the present invention - in particular an efficient system for the production of mixes, preferably dry mixes of building materials, in particular plaster mortar, is to be provided, with the overall aim being to treat the materials gently while at the same time being highly economical.

A mixing device according to the preamble of claim 1 is made US-B1-6 551 401 known.

The above-described task is solved according to the invention by the subject matter of patent claim 1, which relates to the mixing device according to the invention for mixing particulate materials, in particular for producing a dry mixture of building materials, preferably a plaster mortar; further advantageous developments are the subject of the corresponding device subclaims.

Another object of the present invention is the use of the mixing device according to the invention for processing or mixing particulate materials according to the relevant use claim.

Yet another object of the present invention is the plant according to the invention for the production of preferably pourable and/or particulate mixes, preferably dry mixes of building materials, in particular plaster mortar, as defined in the corresponding independent device claim; further advantageous developments and refinements of the system according to the invention are the subject matter of the corresponding device subclaims.

Finally, another object of the present invention is a method for mixing preferably pourable and/or particulate materials, preferably for producing a dry mixture of building materials, in particular a plaster mortar, as defined in the corresponding independent method claim.

It goes without saying that in the following description of the present invention, such configurations, embodiments, advantages, examples or the like, which are described below - for the purpose of avoiding unnecessary repetitions - only for a single aspect of the invention, of course also in relation to the others Aspects of the invention apply accordingly, without requiring express mention.

Furthermore, it goes without saying that in the following statements of values, numbers and ranges, the relevant values, numbers and ranges are not to be understood as limiting; It goes without saying for the person skilled in the art that it is possible to deviate from the specified ranges or specifications in individual cases or in relation to the application, without departing from the scope of the present invention.

In addition, all values or parameter information or the like mentioned below can be determined or determined using standardized or explicitly specified determination methods or otherwise using determination or measurement methods familiar to the person skilled in the art in this field. Unless otherwise stated, the underlying values or parameters are under standard conditions (ie in particular at a temperature of 20 °C and/or at a pressure of 1,013.25 hPa or 1.01325 bar).

Furthermore, it should be noted that for all relevant or percentage, in particular weight-related quantity data listed below, this data must be selected or combined within the scope of the present invention by the person skilled in the art such that in total - possibly including other components or ingredients, in particular as defined below - always result in 100% or 100% by weight. This goes without saying for the expert.

Having said that, the present invention will be described in more detail below.

The subject of the present invention - according to a first aspect of the present invention - is a mixing device for mixing materials, according to claim 1.

The term "materials" as used generically in the context of the present invention is preferably to be understood broadly and includes in particular free-flowing materials or substances which are present in particular in pourable and/or particulate form. The aforementioned term preferably includes all (starting) components used to produce the mixed goods, for example main components and/or binders and/or additives and/or aggregates which are present in different mixing ratios to one another during the mixing or manufacturing process.

The phrase "filling direction predetermined by gravity", as used in the context of the present invention, is to be understood in particular in such a way that the direction of movement of the materials introduced or filled into the mixing container is determined exclusively by the effective direction of the weight of the materials introduced ; In particular, the materials perform an essentially uniform linear movement during introduction into the mixing container, the direction of which is determined almost exclusively by gravity and thus essentially vertically or “down” in the direction of gravitational acceleration and/or perpendicularly or perpendicularly is aligned with the longitudinal axis of the mixing container.

The term “essentially circular” as used in the context of the present invention is to be understood in particular as meaning a cross-sectional profile of the lower container part which is essentially in the form of a semicircular arc and/or a round arc. In particular, the container bottom part of the mixing container is therefore designed as a semi-cylindrical (hollow) body in the sense of the present invention.

The term "working direction" as used in the context of the present invention preferably means a direction of movement of the mixing tools when the mixing shaft is driven or in the operating or application state of the mixing device. In particular, the mixing tools perform a preferably uniform rotary movement within the mixing container.

Provision is preferably made for the inlet means to be arranged and/or designed on the upper part of the container in such a way that the filling direction of the materials introduced into the mixing container is aligned essentially tangentially to the working direction or tangentially opposite to the working direction of the mixing tools.

The basic idea of the present embodiment can therefore be seen in the fact that the mixing device has at least one inlet means specially arranged on the upper part of the mixing container, with the directions of movement the linear filling movement, predetermined by gravity, of the (starting) materials introduced into the mixing container on the one hand and the circular working movement of the mixing tools on the other hand are aligned at least essentially tangentially to one another.

Due to this special movement alignment of the (starting) materials and the mixing tools to one another, it was surprisingly possible to significantly reduce the loads acting on the materials, in particular impact forces, after they were introduced into the mixing container. This enables in particular the processing or mixing of comparatively sensitive, brittle and/or at least partially porous materials, in particular while avoiding undesired dissolution and/or destruction or ensuring the dimensional stability of the materials when they are filled into the mixing container.

In this way, the aforementioned aspect is taken into account in particular, that maintaining the particle size and/or bulk density and/or the pore diameter of the materials is an indispensable or essential requirement criterion for achieving the desired product properties, in particular thermal insulation properties and/or thermal conductivity, of the represents mixed goods.

In other words, in this arrangement a lateral offset of the inlet means or the direction of introduction of the materials is provided with respect to a vertical plane running through the mixing axis of the mixing shaft. In particular, this arrangement and/or design of the inlet means ensures that the materials introduced into the mixing container via the inlet means in the filling direction are not exposed to any (impact) effects with components arranged centrally within the mixing container.

The above-mentioned advantage of a gentle or low-impact introduction of the materials into the mixing container of the mixing device is reinforced in particular by the fact that the filling direction of the materials is aligned essentially tangentially to the working direction or in the working direction of the mixing tools. Consequently, the movements of the materials on the one hand and the mixing tools on the other hand point in an area below the inlet means at least essentially in the same direction, in particular essentially vertically downwards or in the direction of gravity, so that the speed difference between the materials and the mixing tools is reduced , along with a Reducing the impact forces on the materials. In addition, after being fed into the mixing container, the materials are "taken along" by the mixing tools in the working direction, which enables particularly gentle processing and effective mixing at the same time.

As an alternative to the aforementioned direction of movement, it is possible for the materials to enter the mixing container tangentially opposite to the working direction of the mixing tools, in particular to increase the mixing efficiency. This leads in an advantageous manner - although with an increase in the impact forces or loads acting on the materials - to a more intensive turbulence of the filled or introduced materials with mixed goods moving in the opposite direction to the filling direction, accompanied by a more effective mixing of the materials and thus a reduction in the mixing time or Increasing the economic efficiency of the mixing device according to the invention.

According to an independent teaching, which is also relevant to the invention independently of the teaching described above, but which can be implemented in a particularly preferred way in combination with the teaching described above, it is provided that the upper part of the container in a sectional plane running orthogonally to the longitudinal axis of the mixing container in the Substantially U-shaped with two (side) limbs directed towards the container base, the inner surfaces of the limbs of the upper container part on the one hand and the inner base surface of the lower container part on the other hand merging essentially tangentially within the mixing container.

Accordingly, the mixing container according to the invention has two container parts, each with different (cross-sectional) profiles, with the inner surfaces of the legs of the container top part on the one hand and the bottom inner surface of the container bottom part on the other hand merging essentially tangentially within the mixing container.

The design of the mixing container according to the invention leads to an enlargement of the interior space of the mixing container, in particular in comparison to conventional (fully) cylindrical mixing containers. This achieves an increase in the maximum capacity of the mixing container, accompanied by resource-saving operation of the mixing device according to the invention.

In particular, the proposed configuration of the mixing container leads to the formation of additional volume areas which are arranged outside the mixing tools or the envelope curves or circular paths formed or covered by the mixing tools. As a result, indirect mixing areas or turbulence areas for radially accelerated materials or material particles are formed in particular radially outside the immediate processing or mixing zones of the mixing tools, accompanied by improved and/or more efficient mixing or turbulence of the materials within the mixing container.

Furthermore, the aforementioned additional volume areas counteract locally occurring material compaction or compression within the processing zones or mixing zones of the mixing tools, accompanied by gentler processing and/or mixing, in particular of comparatively sensitive and/or brittle or porous materials.

The result of the mixing device is that the inlet movement of the materials introduced and the working movement of the mixing tools are tangentially aligned with one another in a preferred combination with tangentially merging inner surfaces, the mixing device allows gentle processing or mixing of the materials while avoiding dissolution, comminution or compaction of the materials. At the same time, the solution according to the invention allows an economical and resource-saving production of dry mixtures of building materials.

Furthermore, the device according to the invention enables the homogeneous mixing of starting materials with large differences in density.

Fig. 1

einen schematischen Querschnitt einer erfindungsgemäßen Mischvorrichtung, wobei die nicht zur Mischvorrichtung selbst gehörenden, aber zum Verständnis hilfreichen Bauteile, gestrichelt angedeutet sind;

Fig. 2

einen schematischen Längsschnitt einer erfindungsgemäßen Mischvorrichtung gemäß Fig. 1, wobei die nicht zur Mischvorrichtung selbst gehörenden, aber zum Verständnis hilfreichen Bauteile, gestrichelt angedeutet sind;

Fig. 3

eine schematische Draufsicht der erfindungsgemäßen Mischvorrichtung gemäß Fig. 1 bzw. Fig. 2;

Fig. 4

eine schematische Seitenansicht einer erfindungsgemäßen Anlage zur Herstellung von Mischgütern, vorzugsweise Baustofftrockenmischungen, insbesondere Putzmörtel, wobei die Anlage eine erfindungsgemäße Mischvorrichtung aufweist bzw. enthält; und

Fig. 5

eine schematische Vorderansicht der erfindungsgemäßen Anlage gemäß Fig. 4.

In the figure representations shows

1

a schematic cross section of a mixing device according to the invention, wherein the components that do not belong to the mixing device itself but are helpful for understanding are indicated by dashed lines;

2

according to a schematic longitudinal section of a mixing device according to the invention 1 , where the components that do not belong to the mixing device itself but are helpful for understanding are indicated by dashed lines;

3

a schematic plan view of the mixing device according to the invention 1 or. 2 ;

4

a schematic side view of a plant according to the invention for the production of mixed goods, preferably dry mixtures of building materials, in particular plaster mortar, the plant having or containing a mixing device according to the invention; and

figure 5

a schematic front view of the system according to the invention 4 .

Another object of the present invention - according to a second aspect of the present invention - is the use of a mixing device for mixing particulate materials, preferably a dry mixture of building materials, in particular a plaster mortar, according to claim 9.

Another subject matter of the present invention - according to a third aspect of the present invention - is a plant for the production of mixes, preferably dry mixes of building materials, in particular plaster mortar, preferably made of pourable and/or particulate materials, with at least one charging device, preferably a continuous conveyor device, in particular a screw conveyor, for Conveying the materials, a mixing device with a mixing container for mixing the materials to form mixed goods within the mixing container, and a discharge device, preferably a continuous conveyor device, for conveying the mixed goods away from the mixing container of the mixing device, plaster mortar, according to claim 10.

The advantage of designing the discharge device as a bucket elevator is in particular that the discharge of the mixed materials in separate, in particular cup-shaped, transport containers ensures that the desired mixing quality is maintained, in particular while avoiding segregation. Furthermore, the discharge device allows gentle, in particular dust-free, conveyance of the mixed materials from the mixing container.

Finally, another subject matter of the present invention - according to a fourth aspect of the present invention - is a method for producing a mixture, preferably a dry mixture of building materials, in particular plaster mortar, from preferably pourable and/or particulate materials, the materials being fed into a mixing container of a mixing device along a preferably introduced in the filling direction predetermined by gravity via at least one inlet means of the mixing container and mixed materials and/or mixed materials are discharged from the mixing container via at least one outlet means of the mixing container, with a mixing shaft preferably being driven rotatably about a mixing axis inside the mixing container, and with the mixing of the Materials to be mixed preferably axially spaced on the mixing shaft arranged mixing tools within the mixing container with the rotation of the mixing shaft about the mixing axis in a working direction driven, plaster mortar, according to claim 14.

In the following, the present invention is described and explained in more detail, also with reference to drawings or figures showing preferred embodiments or exemplary embodiments, the subject matter of the present invention not being limited to these embodiments.

1 shows a schematic cross-sectional view of a mixing device 1 according to the invention for mixing preferably pourable and/or particulate materials 2.

The mixing device 1 is preferably designed for the production of a material to be mixed and/or a mixture and/or a mixture, preferably a dry mixture of building materials, in particular a plastering mortar.

In particular, the mixing device 1 is designed for discontinuous and/or batch operation. In principle, however, continuous operation of the mixing device 1 according to the invention is also possible.

The mixing device 1 preferably has a mixing container 3 for receiving the materials 2 . In particular, the materials 2 are accommodated in an interior space I of the mixing container 3 .

Preferably, the material 2 in the interior I of the mixing container 3 is essentially in a dry state. However, in principle, mixing or processing of liquid materials is also possible using the mixing device 1 according to the invention.

In the illustrated and preferred embodiment, the mixing container 3 is preferably made of steel, in particular stainless steel or aluminum. However, other materials, for example plastics, in particular ultra high molecular weight polyethylene (UHMW-PE), can also be used.

The mixing container 3 has an upper container part 4 and a lower container part 5 and/or is formed from an upper container part 4 and a lower container part 5 . In particular, when the mixing device 1 is in use and/or in use, the upper container part 4 is arranged above the lower container part 5 .

When the mixing device 1 is in use and/or in use, the upper container part 4 is arranged above the lower container part 5 . The upper container part 4 and the lower container part 5 of the mixing container 3 are preferably designed in one piece or as a structural unit. In this context, it is particularly possible to bring or produce the mixing container 3 into the desired shape, starting from an essentially plate-shaped and/or flat semi-finished product, preferably by forming, in particular bending. This enables a resource-saving and/or economical production of the mixing container 3 according to the invention.

In principle, however, a multi-part design of the mixing container 3 is also possible.

In this context, it is advantageous according to the invention if the upper container part 4 and the lower container part 5 are non-detachably connected to one another, preferably in a materially bonded manner, in particular by welding, soldering or the like. However, in principle, a detachable connection, preferably by molding and/or frictional connection, in particular by screwing, between the upper container part 4 and the lower container part 5 is possible.

As in particular in 2 As can be seen, the mixing device 1 and/or the mixing container 3 preferably extends at least essentially horizontally and/or along a longitudinal axis L, at least in the normal state of use or application.

The lower container part 5 is preferably designed at least essentially as a part-cylindrical or as a part-cylindrical (hollow) body or half-cylinder. According to the invention, the lower container part 5 is designed essentially in the shape of a circular arc in a sectional plane running orthogonally to the longitudinal axis L of the mixing container 3, as shown in FIG 1 shown schematically. In particular, a bottom inner surface 6 of the container lower part 5 facing the interior I of the mixing container 3 is designed as the lateral surface of a semi-cylinder.

The mixing container 3 preferably has a width or extension along a transverse axis running orthogonally to the longitudinal axis L of more than 0.5 m, preferably more than 0.7 m, in particular more than 0.9 m, particularly preferably more than 1.2 m and/or less than 3 m, preferably less than 2.5 m, in particular less than 2 m, particularly preferably less than 1.8 m.

The mixing container 3 preferably has a length or an extension with respect to the longitudinal axis L of more than 1 m, preferably more than 1.2 m, in particular more than 1.5 m, particularly preferably more than 2 m and/or less than 5 m , preferably less than 4 m, in particular less than 3 m, particularly preferably less than 2.5 m.

The mixing device 1 has a mixing shaft 7 which is arranged inside the mixing container 3 so that it can rotate about a mixing axis M and can be driven.

According to the invention, the mixing shaft 7 has mixing tools 8 spaced apart axially on the mixing axis M. In particular, the mixing tools 8 are arranged on the mixing shaft 7, in particular fastened, in such a way that the mixing tools 8 in the interior I of the mixing container 3 rotate in a working direction A about the mixing axis M in a working direction A for processing and/or mixing of the materials 2 in the interior I of the mixing container 3 can be driven, in particular rotated.

Particularly preferably, the mixing tools 8 are offset from one another around the circumference of the mixing shaft 7 .

In the illustrated and preferred exemplary embodiment, axially adjacent and/or consecutive mixing tools 8 are preferably arranged offset from one another by 60°. In principle, however, other arrangement options for the mixing tools 8 relative to one another are also possible.

The mixing container 3 has two or more inlet means 9 for introducing the (starting) materials 2 into the interior I of the mixing container 3 .

The inlet means 9 preferably has an inlet section 9A, in particular an inlet pipe and/or an inlet socket, in particular with the inlet section 9A being arranged in the upper area of the mixing container 3 and/or being aligned substantially perpendicularly or orthogonally to the longitudinal axis L of the mixing container 3 .

Preferably, the inlet section 9A has a channel which forms a passage for the material 2 along the length of the inlet section 9A.

The inlet section 9A preferably extends through the wall of the container upper part 4 of the mixing container 3.

The inlet section 9A preferably has a charging opening 9B at its entrance and a filling opening 9C at its exit.

In particular, the inlet section 9A forms the loading opening 9B and/or the filling opening 9C, preferably with the loading opening 9B in the upper area and/or at the upper end of the inlet section 9A and the filling opening 9C in the lower area of the inlet section 9A and/or on the upper part 4 of the mixing vessel 3 is arranged.

The feed opening 9B and/or the filling opening 9C is/are preferably at least essentially circular. However, other technical solutions are also possible here.

The materials 2 to be introduced preferably enter the channel of the inlet section 9A via the loading opening 9B and out of the channel via the loading opening 9C in a preferably at least substantially vertical and/or linear downward direction and/or filling direction E which is essentially predetermined by gravity out and into the interior I of the mixing container 3 .

The inlet means 9 particularly preferably has at least one fastening means 9D, preferably a flange, for the particular non-positive fastening of a - in figure 1 only schematically indicated - loading device 33 on. In particular, the fastening means 9D is arranged in the upper area of the inlet section 9A and/or in the area of the loading opening 9B of the inlet means 9 . However, other technical solutions are also possible here.

The inlet means 9 preferably has at least one shut-off element 9E, preferably a shut-off valve, for opening and/or closing the charging opening 9B and/or the filling opening 9C.

In particular, the inlet means 9 has a plurality of, preferably two, shut-off elements 9E, preferably with the loading opening 9B and the filling opening 9C each being openable and/or closable via an associated shut-off element 9E.

Provision is preferably made for the inlet means 9 to be arranged and/or designed on the container upper part 4 of the mixing container 3 in such a way that the filling direction E of the materials 2 introduced into the mixing container 3 is aligned essentially tangentially to the working direction A of the mixing tools 8.

As in particular in 1 shown schematically, the preferably tubular inlet section 9A of the inlet means 9 is offset by a lateral distance C with respect to its longitudinal extension or central axis or axis of rotation to a vertical plane V running through the mixing axis M of the mixing shaft 7 .

The lateral distance C between the vertical plane V running through the mixing axis M of the mixing shaft 7 and the central axis or axis of rotation of the inlet means 9 is preferably more than 0.2 m, particularly preferably more than 0.3 m, in particular more than 0.4 m and/or less than 1 m, particularly preferably less than 0.8 m, in particular less than 0.6 m.

According to the invention, the container upper part 4 is essentially U-shaped in a sectional plane running orthogonally to the longitudinal axis L of the mixing container 2 .

According to the invention, the upper container part 4 has a first leg 11 and a second leg 12, the legs 11, 12 being directed toward the lower container part 5 and/or downwards and/or in the filling direction E of the materials 2 introduced. In particular, in the interior I of the mixing container 3, the associated inner limb surfaces 13 or 14 of the limbs 11 or 12 and the bottom inner surface 6 of the lower container part 5 merge into one another essentially tangentially.

According to the invention, the mixing container 3 has at least one outlet means 10 for discharging and/or conveying away and/or discharging the materials 2 from the mixing container 3 .

Particularly preferred is the outlet means 10 with a - in figure 1 only schematically indicated - discharge device 34 for conveying away the materials to be mixed from the mixing container 3 of the mixing device 1 and/or can be connected. The outlet means 10 is particularly preferably designed to open and/or close the lower container part 5 of the mixing container 3 .

The mixing tools 8 preferably move with the rotation of the mixing shaft 7 about the mixing axis M within the mixing container 3, in particular uniformly in the working direction A along a circular path K.

In the embodiment according to 1 the working direction A corresponds to a direction of rotation counterclockwise, counterclockwise or in the mathematically positive sense of rotation or rotation. Of course, a reversal of the working direction as a clockwise direction of rotation, clockwise rotation or in the mathematically positive direction of rotation or rotation is also possible.

A “circular path” within the meaning of the present invention preferably defines or determines the maximum radius of movement of the mixing tools 8 and/or is in the sense of the present invention to be understood as a spatial curve along which the mixing tools 8 move in the working direction A or opposite to the working direction A in the area of the free ends and/or maximum radial extent within the mixing container 3 .

2 shows the proposed mixing device 1 in the position of use or in the state of use.

It is preferred if the mixing container 3 and/or the mixing shaft 7, in particular in the operating and/or application state and/or use state of the mixing device 1, are/is arranged and/or aligned at least essentially horizontally and/or lying down, in particular related to the longitudinal axis L of the mixing container 3 and/or the mixing axis M of the mixing shaft 7. This allows the materials 2 to be mixed gently, in particular while avoiding material compaction and/or compression in the interior I of the mixing container 3.

According to a further preferred embodiment of the mixing device 1 according to the invention, it is provided that the mixing shaft 7 is arranged and/or aligned at least essentially concentrically to a central axis or axis of rotation (not shown) of the lower container part 5 .

The central axis or axis of rotation of the lower container part 5 particularly preferably corresponds at least essentially to the mixing axis M of the mixing shaft 7.

As far as the arrangement of the inlet means 9 on the mixing container 3 is concerned, it is preferred if the inlet means 9 is arranged in and/or on the upper area of the mixing container 3 .

In this context, it has proven to be particularly advantageous if the inlet means 9 is arranged on a preferably substantially planar and/or flat mixing container cover 15 of the upper part 4 of the container.

The mixing container cover 15 is particularly preferably of essentially rectangular design, preferably with the mixing container cover 15 being detachably connected to the legs 11 , 12 .

An inner surface 16 of the mixing container cover 15 facing the interior I of the mixing container 3 is particularly preferably offset in height relative to the circular path K of the mixing tools 8 .

In particular, the inside surface 16 of the mixing container lid 15 runs at least essentially parallel with a height offset H to a tangent T running through the upper extreme point of the circular path K of the mixing tools 8.

The height offset H between the inner surface 16 of the mixing container lid 15 and the tangent T of the circular path K is preferably more than 10 cm, in particular more than 15 cm, particularly preferably more than 20 cm and/or less than 2 m, preferably less than 1.5 m, in particular less than 1 m.

Due to the proposed height offset H between the inner surface 16 of the cover and the tangent T, a turbulence area is formed above the circular path K formed by the mixing tools 8 . This permits improved mixing, in particular turbulence, of materials 2 accelerated upwards within the mixing container 3. Furthermore, undesired material compaction and/or compression between the inner surface of the cover 16 on the one hand and the mixing tools 8 on the other are effectively avoided in this way.

According to a further preferred embodiment, it can also be provided that the circular paths K or envelope curves formed and/or swept by the mixing tools 8 in each case intersect one another in the axial direction. This contributes to an effective mixing of the materials 2, in particular in the axial direction of the mixing shaft 7 and / or along the entire length of the mixing container 3 the formation of "dead zones" - in which no direct processing or mixing of the materials 2 by the Mixing tools 8 takes place - effectively avoided.

Furthermore, it is preferred if the mixing container lid 15 connects the first leg 11 to the second leg 12 and/or is arranged between the first leg 11 and the second leg 12 .

It is preferred if the container upper part 4 has a substantially angular U-shaped (cross-sectional) profile in a sectional plane running orthogonally to the longitudinal axis L of the mixing container 3 .

The mixing container lid 15 is preferably formed in one piece with the first leg 11 and/or the second leg 12 of the upper part 4 of the container. However, other constructive solutions are also possible here.

The first leg 11 is preferably arranged at least essentially parallel to and/or spaced apart from the second leg 12 . Particularly preferably, the mixing container lid 15 runs at least essentially orthogonally to the first leg 11 and/or second leg 12 of the container upper part 4.

As far as the structure of the mixing tools 8 is concerned, it is preferred if each of the mixing tools 8 has at least one mixing body 8A for processing and/or mixing and/or plowing through the materials 2 inside the mixing container 3 and at least one mixing arm 8B projecting radially from the mixing shaft 7 for fastening the mixing body 8A to the mixing shaft 7.

The mixing arm 8B of the mixing tool 8 is preferably connected to the mixing shaft 7 in a non-detachable manner, in particular in a materially bonded manner, preferably by means of welding. However, other constructive solutions are also possible here.

It has proven to be advantageous within the scope of the present invention if the mixing arm 8B of the mixing tool 8 has a substantially circular and/or substantially cylindrical cross section. This is conducive to gentle processing and/or mixing of the materials 2 within the mixing container 3, since the materials 2 are guided evenly or continuously around a substantially edge-free and/or curved (cylindrical) lateral surface of the mixing arm 8B during mixing or processing .

As far as the design of the mixing body 8A for processing and/or mixing and/or plowing through the materials 2 within the mixing container 3 is concerned, it is preferred if the mixing body 8A of the mixing tool 8 is designed essentially paddle-like and/or preferably an essentially flat one and/or flat mixing body surface 8AA. The proposed design of the mixing body 8A and/or the mixing body surface 8AA also ensures gentle processing and/or mixing of the materials 2 within of the mixing container 3 is achieved, in particular by reducing the shearing or frictional forces acting on the materials 2.

In particular, the mixing tools 8, in particular the mixing bodies 8A of the mixing tools 8, extend from the mixing shaft 7 in the radial direction to near the bottom inner surface 6 of the lower container part 5. The mixing container 3 preferably has a first axial end 17 and a second axial end 18 and/or is limited by two axial ends 17 and 18 with respect to its (longitudinal) extension along the longitudinal axis L.

It is provided according to the invention that the mixing container 3 is closed and/or lockable at its axial ends 17 and 18 by two preferably disc-shaped end walls 19 and 20 .

Preferably, the end walls 19 and 20 each form an associated axial end 17 or 18 of the mixing container 3.

In this context, it is particularly advantageous if at least one of the end walls 19, 20 is connected to the mixing container 3 in a detachable manner, in particular by screwing. This allows the mixing container 3 to be opened at the front if necessary for maintenance and/or inspection purposes and thus serves to ensure robust and/or user-friendly operation of the mixing device 1 according to the invention.

As explained above, the container upper part 4 preferably has two inlet means 9 for introducing the (starting) materials 2 along the filling direction E, which is preferably predetermined by gravity, into the interior I of the mixing container 3 .

According to the invention, the inlet means 9 are each arranged in the area of an axial end 17, 18 and/or an end wall 19, 20 of the mixing container 3. This permits efficient mixing, in particular using a maximum axial mixing path within the mixing container 3.

Now as regards the outlet means 10, according to the invention the outlet means 10 is substantially midway between the inlet means 9 and/or the axial ones Ends 17, 18 and / or the end walls 19, 20 of the mixing container 3 are arranged.

The mixing tools 8 , preferably the mixing bodies 8A of the mixing tools 8 , are preferably designed for both radial and axial mixing and/or conveying of the materials 2 within the mixing container 3 . The mixing tools 8 , in particular the mixing bodies 8A of the mixing tools 8 , preferably have an angle W to the mixing axis M of the mixing shaft 7 .

As far as the angle of attack W of the mixing bodies 8A is concerned, this can vary within wide ranges depending on the degree of the desired axial conveyance of the materials 2 and/or the shearing forces to be expected. In practice, it has proven to be advantageous if the angle of attack W is in the range from 5 to 80°, preferably 10 to 70°, in particular 20 to 60°, particularly preferably 30 to 50°.

According to the invention, the materials 2 can be conveyed from the axial ends 17, 18 and/or end walls 19, 20 of the mixing container 3 to the axial center of the mixing container 3, preferably to the outlet means 10 of the mixing container 3, along opposite axial conveying directions X ₁ and X ₂ . Due to the opposite axial conveying directions X ₁ , X _{2 of} the materials 2 introduced, efficient mixing or processing of the materials 2 is achieved during the mixing process, which means that the materials 2 can be produced and/or mixed quickly to form the ready-to-use mix and/or efficient emptying of the Mixing tank 3 is realized.

As far as the arrangement of the outlet means 10 on the mixing container 3 is concerned, it is in accordance with the invention if the outlet means 10 is arranged on the lower area of the bottom part 5 .

According to the invention, the outlet means 10 is arranged in the area of the center of the lower container part 5 .

The term "center of the container base 5" in the sense of the present invention is preferably to be understood as an intersection between the central axis and / or axis of rotation of the container base 5 on the one hand and a transverse on the other hand, is formed running to this central axis or axis of rotation and running through the lower container part 5 in the middle of the transverse axis.

The proposed arrangement of the outlet means 10 on the lower part 5 of the mixing container 3 allows improved mixing or processing of the materials 2 while at the same time effectively emptying the mixing container 3.

The mixing device 1 preferably has at least one scraping device 21 to avoid permanent deposits of materials 2 in the interior I of the mixing container 3 .

In particular, the stripping device 21 is designed to remove, in particular strip, materials 2 deposited on the inner surfaces of the end walls 19 and/or 20 .

The stripping device 21 is particularly preferably arranged in the region of an axial end 17, 18 and/or an end wall 19, 20 in the interior I of the mixing container 3.

Preferably, the stripping device 21 is elongate.

Particularly preferably, the scraper device 21 is at least essentially wedge-shaped in cross section, preferably with a wedge tip of the scraper device 21 pointing in the working direction A of the mixing tools 8 running at least essentially parallel to the inner surface of the associated end wall 19 or 20, in particular with the scraper device 21 with its pointing in the working direction A sweeps the inner surface of the associated end wall 19 or 20.

In particular, the stripping device 21 is arranged in the interior I of the mixing container 3 in the region of the axial end 17 or 18 and/or the end wall 19 or 20 on the mixing shaft 7 and/or a mixing tool 8, preferably fastened.

In particular, the stripping device 21 is permanently attached to the mixing shaft 7 and/or the mixing tool 8, preferably by welding.

In particular, the scraping device 21 extends, starting from the mixing shaft 7, in the radial direction to the mixing body 8A of the mixing tool 8, preferably with the scraping device 21 being connected to an end of the mixing body 8A of the mixing tool 8 pointing in the working direction A of the mixing tools 8, preferably in a non-detachable manner. In particular, the scraping device 21 extends in the radial direction, starting from the mixing shaft 7 to the radial end of the mixing tools 8 and/or to the circular path K of the mixing tools 8. This enables a maximum (swept) area for removing deposits on the inner surface of the associated End wall 19 or 20.

The mixing device 1 particularly preferably has two scraping devices 21, which are arranged in the area of the axial ends 17 and 18 and/or the end walls 19 and 20 of the mixing container 3, in particular with the rotation of the mixing tools 8 in the working direction A both inner surfaces of the end walls 19 and 20 are touched or swept over by associated stripping devices 21 .

According to an advantageous embodiment, the mixing shaft 7 of the mixing device 1 is mounted rotatably about the mixing axis M outside the mixing container 3, in particular outside the end walls 19, 20 of the mixing container 3, via assigned bearing devices 22, 23 at the end.

To seal the mixing shaft 7, a sealing element, in particular a stuffing box, is preferably provided in the area of the end walls 19, 20 in each case. The stuffing box preferably has a stuffing box sleeve in which the mixing shaft 7 is accommodated. A stuffing box packing is preferably provided as a sealing material between the mixing shaft 7 and the stuffing box sleeve. The stuffing box packing is pressed axially via a stuffing box gland, so that the stuffing box packing expands radially and is pressed against the mixing shaft 7, in particular the surface pressure being adjustable via the stuffing box gland.

The mixing device 1, in particular the mixing shaft 7 of the mixing device 1, can preferably be driven by means of a drive device 24, preferably an electric motor, in particular a low-voltage asynchronous motor, with the drive device 24 preferably being arranged outside the mixing container 3. In addition, the mixing device 1, preferably the drive device 24, has a gear device 25 for introducing a (nominal) torque fed via the drive device 24 to the mixing shaft 7, preferably wherein the transmission device 25 is arranged at the end on the mixing shaft 7, in particular plugged on.

As far as the outlet means 10 is concerned, the outlet means 10 preferably has an outlet opening 10A, which opens into the interior I of the mixing container 3 and/or penetrates the wall of the lower container part 5, for the outlet of the materials 2 from the interior I of the mixing container 3. In particular, the outlet opening 10A is arranged at the lower area of the container base 5 .

In particular, the mixed materials 2 emerge from the interior I of the mixing container 3 via the outlet opening 10A of the outlet means 10 in the form of a flow of mixed material G, preferably with the direction of the flow of mixed material G being essentially predetermined by gravity and/or downwards and/or perpendicular to the Longitudinal axis L of the mixing container 3 is directed, as indicated by a corresponding arrow in 2 is indicated schematically.

According to a preferred embodiment of the mixing device 1 according to the invention, it is provided that the outlet means 10 has at least one closure element 10B, preferably arranged in the lower region of the container base 5, preferably a pivotable closure flap, for opening and/or closing the outlet opening 10A of the container base 5 and/or or shutting off and/or releasing the mixed material flow G exiting from the mixing container 3 .

The closure element 10B is preferably adapted to the shape, in particular cross-sectional shape, of the lower container part 5, preferably with the closure element 10B being curved and/or at least partially arcuate in cross section. This allows the lower container part 5 to be closed with almost no dead space or loss by the closure element 10B.

The outlet means 10 preferably has an essentially cone-like outlet element 10C for discharging and/or guiding the materials 2 out of the mixing container 3 . This enables the mixed materials 2 to be discharged from the mixing container 3 in a comfortable and/or gentle, in particular dust-free manner.

The outlet element 10C preferably tapers in the direction of the flow of mixed material G and/or converges in the direction of the flow of mixed material G.

The outlet element 10C preferably has an internal or discharge cross section Q that decreases in the direction of the flow of mixed material G, preferably with the discharge section Q in the direction of the flow of mixed material G initially being constant and then decreasing. This allows the mix flow G to be effectively discharged from the mixing container 3.

The discharge cross section Q of the outlet element 10C is preferably an inner or flow cross-sectional area perpendicular to the longitudinal axis or (discharge) direction of the mix flow G of the outlet element 10C or a hydraulic cross section or a hydraulic cross-sectional area. In particular, the discharge cross section Q is the area delimited or enclosed by a side wall of the outlet element 10C.

In the area of the outlet opening 10A, the outlet means 10 preferably has a connecting section 10D, in particular a pipe socket, arranged on the lower container part 5, the connecting section 10D preferably having a connecting means 10E, in particular a flange, at its end facing away from the lower container part 5.

The outlet element 10C is preferably connected on the inlet side to the connecting means 10E of the connecting section 10D, in particular in a non-positive manner, preferably by means of screwing, and/or is held on the lower container part 5 of the mixing container 3 .

The outlet means 10 preferably has at least one opening 10F penetrating the outlet element 10C for introducing air, in particular compressed air, preferably by means of a compressed air device (not shown), into the interior of the outlet element 10C. The targeted introduction of compressed air within the outlet element 10C enables the materials 2 to be discharged or conveyed away in a particularly uniform manner.

In particular, the outlet means 10 has a plurality of openings 10F passing through the outlet element 10C, preferably with the openings 10F being distributed in particular uniformly around the circumference of the outlet element 10C. This allows effective loosening of the Mixing material flow G, in particular in the entire area of the discharge cross section Q and thus enables the mixed materials 2 to be conveyed away effectively and/or uniformly from the mixing container 3.

According to a further advantageous embodiment of the outlet means 10 according to the invention, provision is made for the outlet means 10, preferably the outlet element 10C, to have at least one feed device 26, in particular a wing sluice, for preventing and/or releasing and/or regulating the flow of mixed material G. This allows a targeted, in particular metered, delivery or removal of the mixed material flow G.

The feed device 26 is preferably arranged in the area of a filling opening 10CA of the outlet element 10C. This allows targeted regulation and/or release and/or blocking of the flow of mixed material G and/or effective removal of the mixed materials 2 from the mixing container 3.

In this context, the use of a wing sluice as the proposed feed device 26 is preferred, since this enables a particularly precise regulation of the flow of mixed material G while at the same time treating the material gently, in particular while avoiding material compression and/or high shearing forces.

Furthermore, it can be advantageous according to the invention if the mixing device 1 has at least one filter device 27 with a filter 28 for filtering a fluid flow, preferably an air flow, exiting and/or entering the mixing container 3 .

In this context, it is advantageous according to the invention if the filter device 27 is arranged on the upper part 4 of the container, preferably on the mixing container cover 15 of the mixing container 3 .

In particular, the filter device 27 is detachably connected to the mixing container cover 15 of the mixing container 3 , preferably in a non-positive manner, in particular by means of screwing.

As far as the arrangement of the filter device 27 on the mixing container 3 is concerned, the invention provides for the filter device 27 to be arranged essentially in the center of the mixing container cover 15 .

The term "centre of the mixing container cover" as used in the context of the present invention is preferably to be understood as the intersection of two bisectors of the preferably rectangular, in particular square, mixing container cover 15 .

The filter device 27 preferably has a cleaning unit 29 for cleaning the filter 28 in a preferably pulsed and/or controlled, preferably pressure-controlled, in particular differential pressure-controlled manner. This guarantees reliable and trouble-free operation of the mixing device 1 according to the invention.

The degree of contamination of the filter 28 is preferably automatically monitored via a differential pressure measurement via a controller (not shown), in particular with a cleaning event of the filter in the form of a compressed air pulse being automatically triggered after a certain differential pressure has been reached. In this way, emission-free operation of the mixing device 1 is made possible, in particular with the emission of particles to the environment being effectively prevented during the mixing process. Due to the differential pressure-controlled cleaning, it is not necessary to replace the filter 28 under normal conditions. It goes without saying, however, that manual cleaning of the filter 28 is also possible in the case of heavily adhering contamination.

The mixing device 1, in particular the mixing container 3, is preferably supported on a base, preferably a floor B, at least in the position of use.

The mixing device 1 particularly preferably has at least one support element 30 , preferably with the mixing container 3 being or being supported on the supporting element 30 and/or being or being connected to the base B by means of the supporting element 30 .

The support element 30 is preferably elongate and/or designed as a hollow body with an essentially rectangular cross-sectional profile.

In this context, it is particularly preferred if the mixing container 3 is lifted off the floor B or raised relative to the floor B by means of the support element 30 .

The support element 30 is particularly preferably detachably attached, in particular by screwing, to the lower container part 5 of the mixing container 3 .

In particular, the support element 30 is designed in several parts, in particular in two parts, preferably with the individual parts of the support element 30 being detachably connected to one another, preferably by screwing.

The mixing device 1 particularly preferably has a plurality of, preferably four, support elements 30 , in particular with the support elements 30 each being arranged in the region of the axial ends 17 , 18 of the mixing container 3 , in particular in pairs opposite one another. This enables comfortable and/or unhindered access to the middle, lower area of the mixing container 3.

Particularly preferably, the supporting elements 30 arranged in pairs in the region of the axial ends 18 and 19 of the mixing container 3 engage oppositely on an associated leg 11 or 12 of the upper part 4 of the container.

The mixing device 1 or the mixing container 3 preferably has one or more, preferably four, weighing means (not shown) for weighing the materials 2 accommodated in the mixing container 3 . The mixing device 1 or the mixing container 3 is preferably supported—in particular via the supporting elements 30—on the weighing means or weighing means, in particular with each supporting element 30 being assigned a weighing means. The weighing device(s) is/are designed in particular as a force transducer, in particular a load cell(s), preferably with a deformation of a component of the load cell(s) being able to be detected and converted into an electronic signal. In this way, reliable and/or precise weighing of the materials 2 in the mixing container 3 is possible.

3 shows the mixing device 1 according to the invention in a schematic plan view.

Referring to 3 According to the invention, it can be advantageous if the mixing container 3, preferably the upper part 4 of the mixing container 3, has three inlet means 9 for introducing the materials 2 along the filling direction E into the mixing container 3.

According to a preferred embodiment of the mixing device 1 it is provided that the mixing container 3 has at least one mixing container flap 31 for opening and/or closing the mixing container 3 in the upper area, preferably on the mixing container cover 15 . This allows easy and/or large-area access to the interior I of the mixing container 3.

In this context, it is preferred if the mixing container flap 31 is at least essentially plate-shaped and/or flat and/or rectangular.

The mixing container lid 15 particularly preferably has a plurality of, preferably two, mixing container flaps 31 for opening and/or closing the mixing container 3 .

In particular, the mixing container flaps 31 are each arranged pivotably on the mixing container cover 15 of the mixing container 3 about a pivot axis S that is essentially horizontal.

In addition or as an alternative, at least one maintenance flap, which can preferably be swung open to the side, is provided on the leg 11 or 12 . Particularly preferably, at least one, in particular both, legs 11 or 12 has or have two maintenance flaps, in particular the maintenance flaps being mounted in the region of the end walls 19, 20 about a preferably vertical pivot axis. This allows easy access to the interior I of the mixing container 3.

Particularly preferably, the container upper part 4 has several, preferably four, inlet means 9 for introducing the materials 2 along the filling direction E into the mixing container 3 .

In particular, the four inlet means 9 are each arranged in pairs in the area of the axial ends 17, 18 of the mixing container 3, preferably with the inlet means 9 in the area of the assigned axial ends 17 or 18 being opposite one another in the area of an assigned leg 11 or 12 of the upper part of the container 4 are arranged.

The assignment of the inlet means 9 in the region of an assigned leg 11 or 12 of the upper part 4 of the container, preferably in opposite pairs, is permitted a targeted introduction of different materials into the mixing container 3 via corresponding inlet means 9. In this context, for example, it is possible to introduce comparatively sensitive materials in the area of the leg 11, so that the filling direction E is oriented tangentially in the working direction A of the mixing tools 8, whereas, preferably, less sensitive materials can be introduced in the region of the leg 12, so that the filling direction of these materials is oriented tangentially opposite to the working direction A of the mixing tools 8.

The inlet means 9 are particularly preferably arranged on the mixing container cover 15 of the mixing container 3 in such a way that they form the corners of a rectangle, as in particular in FIG 3 illustrated plan view visible.

As far as the volume of the mixing container 3 is concerned, this can vary within wide ranges depending on the desired batch. According to the invention, however, it is preferred if the mixing container 3 has a volume of 50 to 10,000 l, in particular 100 to 9,000 l, preferably 500 to 7,000 l, preferably 1,000 to 5,000 l, particularly preferably 2,000 to 4,000 l, very particularly preferably 2,500 to 3,500 l , having.

According to a particularly preferred embodiment, at least one, preferably both legs 11, 12 has or have at least one suspension element, in particular an eyelet, for attaching a lifting device, preferably a crane. At least four suspension elements are particularly preferably provided, in particular with each suspension element being assigned to a maintenance flap and being arranged on the upper side in the region of the respective pivot axis of the maintenance flap. Alternatively or additionally, at least one suspension element can also be provided, preferably on the top side on each end wall 19, 20.

One aspect of the present invention relates to a plant 32 for the production of mixes, preferably dry mixes of building materials, in particular plaster mortar, from preferably pourable and/or particulate materials.

In 4 the system 32 according to the invention is shown in a side view.

According to the invention, the system 32 has at least one loading device 33, preferably a continuous conveyor device, in particular a screw conveyor, for conveying the materials 2.

In the illustrated and preferred embodiment, the loading device 33 is designed as a screw conveyor. This allows an effective and/or gentle and/or metered conveyance of the materials 2.

In particular, the loading device 33 is designed to feed the materials 2 to the mixing device 1 , preferably to the mixing container 3 of the mixing device 1 .

The conveying outlet of the loading device 33 is preferably arranged and/or oriented above the loading opening 9B of the inlet means 9, so that the material 2 fed to the mixing container 3 by means of the loading device 33 can be introduced into the mixing container 3 of the mixing device 1 via the inlet means 9.

The charging device 33 is particularly preferably attached to the inlet means 9 of the container upper part 4 in the region of the conveying outlet, preferably with the charging device 33 being non-positively connected, in particular screwed, to the fastening means 9D of the inlet means 9 . This enables the loading device 33 to be securely fastened to the mixing container 3 of the mixing device 1.

In particular, the loading device 33 is designed to convey the materials 2 along a conveying direction directed obliquely upwards. Alternatively, however, it is also possible to convey the materials 2 along a substantially horizontal conveying direction.

For removing and/or discharging the mixed materials 2 from the mixing container 3, the system 32 has at least one discharge device 34, preferably a continuous conveying device.

The conveying inlet or the feed opening of the discharge device 34 is preferably arranged below the mixing container 3 .

In particular, the conveying inlet of the discharge device 34 is arranged below the outlet element 10 of the lower container part 5, preferably so that the discharge device 34 can be supplied with mixed materials from the mixing container 3 via the outlet means 10, in particular metered by means of the feed device 26. The discharge device 34 is particularly preferably connected to the outlet means 10 at the conveying inlet, in particular in a non-positive manner, preferably by screwing. This allows the mixed materials 2 to be fed safely, in particular without dust, from the mixing container 3 to the discharge device 34.

Provision is preferably made for the discharge device 34 to be in the form of a bucket elevator. The advantage of this design of the discharge device 34 is in particular that the discharge of the mixed materials 2 in separate, in particular cup-shaped, transport containers of the discharge device 34 ensures that the desired mixing quality is maintained, in particular while avoiding segregation. Furthermore, the discharge device 34 allows the mixed materials 2 to be conveyed out of the mixing container 3 gently, in particular without dust.

In this context, it has proven to be particularly advantageous if the discharge device 34 is designed to convey the mixed materials 2 away from the mixing container 3 along a vertical and/or horizontal conveying direction. This allows an individually adaptable alignment of the discharge device 34 and thus a space-saving and/or space-saving (removal) conveyance of the materials 2 from the mixing container 3 of the mixing device 1.

According to a particularly preferred embodiment, the discharge device 34 is designed as a pendulum bucket elevator. This allows economical operation while at the same time gently conveying the materials 2, in particular while avoiding segregation and/or material compaction during the conveyance of the mixed materials 2.

Alternatively or additionally, it can be provided that the discharge device 34 has a substantially Z-shaped line. This allows a targeted sequence of horizontal and vertical conveying sections or conveying directions of the materials 2.

In order to increase the efficiency of the delivery rate of the discharge device 34 in particular, a tapping device can be installed at the delivery outlet or at the discharge opening of the discharge device 34 in particular a pendulum knocker, can be provided, preferably with an impact impulse being exerted by means of the knocking device on the bucket elements of the bucket elevator, in particular after the material to be mixed has been emptied. In this way, an almost residue-free emptying of the bucket elements of the angle bucket elevator is guaranteed.

The system 32 preferably has at least one storage device 35, preferably a storage container, for receiving and/or storing the materials 2 and/or mixed goods.

In particular, it is preferred according to the invention if the system 32 has a plurality of storage devices 35 for the separate storage and/or storage of different materials 2 and/or the mixed goods.

The storage devices 35 are particularly preferably configured differently. This enables different materials 2 to be received and/or stored in storage devices 35 specially designed with regard to the material properties of the materials 2 and/or mixed goods.

For example, it is preferred if at least one of the storage devices 35 is designed as a flexible storage container 35A, in particular a big bag. The use of flexible storage containers 35A allows, in particular, weight-saving and/or convenient handling, in particular with easier emptying and/or resource-saving or user-friendly replacement of the storage containers 35A being/is made possible.

As in 4 is shown schematically, at least one of the flexible storage containers 35A is suspended at the top from a vertically adjustable hoist, in particular an electric chain hoist. The hoist can be moved horizontally on a rail, which in turn is fixed to a base frame. Lowering the storage tank 34A with the hoist makes it easier to empty the storage tank 35A. In addition, the storage container 35A can be moved horizontally out of the basic framework, which makes it easier to replace an emptied storage container 35A.

In particular, each storage container 35A preferably has a volume of 1,000 l to 5,000 l, preferably 1,500 l to 4,000 l, in particular 2,000 l to 3,000 l, very particularly preferably 2,400 l to 2,600 l.

Alternatively or additionally, at least one of the storage devices 35 is designed as a rigid storage container 35B, in particular a silo. This allows the materials 2 to be mixed to be stored and/or accommodated in a robust or resilient manner and/or enables associated charging and/or removal devices to be attached in a robust manner.

In this context, it is preferred if the rigid storage container 35B has a volume of at least 20,000 l, preferably at least 30,000 l, more preferably at least 40,000 l and/or less than 100,000 l, preferably less than 90,000 l, more preferably less than 80,000 l. having.

Alternatively or additionally, at least one of the storage devices 35 is designed as a weighing container 35C for measuring, in particular weighing, the materials 2. This allows a targeted or metered loading of the mixing container 3 with materials 2. In particular, the weighing container 35C forms a hand scale mount and/or has such a mount. This allows for efficient manual loading of blending bin 3 via weigh bin 35C.

With regard to the design of the weighing container 35C, it is preferred that the weighing container 35C is elongated and/or substantially funnel-shaped.

In particular, the weighing container 35C is arranged and/or aligned at least essentially horizontally and/or lying down in the operating and/or application state, in particular in relation to a longitudinal axis (not shown) of the weighing container 35C.

In this context, it has proven to be advantageous if the materials 2 introduced into the weighing container 35C can be discharged by means of a charging device 33 arranged in the lower region of the weighing container 35C, preferably with the charging device 33 running essentially axially through the weighing container 35C. This allows the materials 2 introduced to be safely removed or conveyed away from the weighing container 35C and/or the materials 2 introduced into the weighing container 35C to be fed to the mixing container 3 along a substantially axial conveying direction.

The system 32 particularly preferably has at least one small scale, in particular with a weighing range of 10 to 100 kg. In particular, the minute components weighed by the small scale can be fed manually to the weighing container 35C.

Alternatively or additionally, at least one of the storage devices 35 is designed as a preferably rigid mix container 35D, in particular a silo, for receiving and/or storing completely mixed materials 2 or mixes, as shown in figure 5 is indicated schematically.

In this context, it is particularly preferred if the mix container 35D is arranged in the region of the conveying outlet or the discharge opening of the discharge device 34, preferably so that the mix container 35D can be loaded with the mix via the discharge device 34.

The system 32 particularly preferably has a plurality of, preferably two, mix containers 35D, preferably with the mix containers 35D being arranged at the conveying outlet or at the discharge opening of the discharge device 34 in such a way that the mix containers 35D can be loaded with mix materials preferably simultaneously via the discharge device 34.

The system 32 particularly preferably has a plurality of feed devices 33 for feeding the materials 2 to the mixing container 3 of the mixing device 1 .

In particular, it is preferred in this context if several, preferably four, charging devices 33 are arranged, in particular fastened, in the upper region of the mixing container 3 on associated inlet means 9, as in 3 is indicated schematically. This allows several, preferably four, possibly different materials 2 to be fed into the mixing container 3 of the mixing device 1, in particular simultaneously.

According to a particularly preferred embodiment of the system 32 according to the invention, it is provided that each of the storage devices 35A - 35C has a separate loading device 33 for individually feeding the materials 2 from the associated storage device 35A - 35C to the mixing container 3 . This permits a targeted or individual supply of different materials 2 to the mixing container 3 from the associated storage devices 35A-35C.

The system 32, in particular at least one of the storage devices 35A-35C, preferably has at least one weighing device, in particular a load cell, for weighing the materials 2. In this way, a reliable supply or dosing of the materials 2 is guaranteed.

According to a preferred embodiment of the system 32 according to the invention, it is provided that the system 32 has a support structure 36 with an accessible access platform 37 for accessing and/or operating the mixing device 1 , preferably the mixing container lid 15 .

A base area 38 of the access platform 37 is particularly preferably arranged in the upper area of the mixing container 3 , preferably at the height of the mixing container cover 15 .

The base area 38 of the access platform 37 preferably has at least one preferably essentially rectangular opening 39 , preferably with the mixing device 1 , in particular the mixing container 3 , being guided at least partially through the opening 39 .

The mixing container 3 is particularly preferably passed through the opening 39 in the access platform 37 in such a way that the top of the mixing container 3, preferably the mixing container cover 15, and the base 38 of the access platform 37 are at least essentially in the same plane. This allows easy access to the mixing container lid 15 and enables safe operation of the mixing device 1.

It is preferred if the support structure 36, in particular the access platform 37, has a load and/or load capacity of at least 1000 kg, preferably at least 2000 kg, in particular at least 2500 kg, particularly preferably at least 3000 kg.

The supporting structure 36 preferably has at least one stair element 40 which has essentially the same height as the access platform 37 so that the access platform 37 can be reached by means of the stair element 40 .

According to a further advantageous embodiment of the system 32 according to the invention, it is provided that the system 32 has at least one filling device 41, in particular a bagging device, for the removal, preferably in portions of the mixed material. This allows the end product to be conveyed away in the form of compact or easy-to-handle containers.

In particular, at least one mixing material container 35D is assigned to the filling device 41, preferably with the filling device 41 being able to be supplied with mixing material by means of the mixing material container 35D.

According to a particularly preferred (not shown) embodiment of the present invention, at least one mix container 35D has a discharge pipe. The emptying pipe is preferably arranged in the middle or centrally in the material mix hopper 35D and preferably extends over at least 80%, in particular over at least 90%, of the height of the material mix hopper 35D. The discharge pipe is preferably designed to discharge the mixed material from the mixed material container 35D and/or to feed it to the filling device 41 . In particular, the discharge pipe forms a vertical flow channel for the mix, preferably with the flow cross section of the discharge pipe being at most 30%, preferably at most 20%, of the cross-sectional area of the mix container 35D. The discharge pipe preferably has a large number of through-flow openings which are designed in particular to guide the material to be mixed inside the material-mix container 35D into the interior of the discharge pipe. The through-flow openings are preferably arranged equidistantly or evenly distributed over the length and/or the circumference of the emptying pipe. The mixed material is in particular discharged exclusively via the emptying pipe from the mixed material container 35D and/or fed to the filling device 41, in particular with the mixed material being able to be introduced into the emptying pipe via the flow openings depending on its fill level. The emptying pipe thus enables the mixing material container 35D to be emptied essentially in layers. This permits an effective and/or reliable delivery of mix, in particular since segregation of the mix in the mix container 35D is ruled out or at least minimized.

In this context, it is particularly preferred if the system 32 has a plurality of, preferably two, filling devices 41 , with each filling device 41 preferably being assigned a corresponding mixed material container 35D for feeding the mixed material to the filling device 41 . This permits efficient, in particular simultaneous, filling of the mixed materials using a plurality of filling devices 41.

The two mixing material containers 35D are particularly preferably connected to the conveying outlet or the discharge opening of the discharge device 34 via a distribution device, in particular a two-way distributor. In this way, the mixed material that has been discharged can be selectively fed into the two mixed material containers 35D.

The filling device 41 particularly preferably has a welding device for welding the filled mixed material sacks.

According to a particularly preferred (not shown) embodiment of the present invention, the system 32, in particular the filling device 41 and/or the mixing material container 35D, has at least one extraction device which is designed to extract, in particular suction off, released parts or particles of the material to be mixed /or collect. In particular, the extraction device is designed as a suction device for picking up particulate materials. Additionally or alternatively, it can be provided that the system 32 and/or the filling device 41 and/or the extraction device has or forms a return device, for example a hose and/or pipeline, for returning the removed or sucked off parts of the mix to the mix container 35D . In this way, filling or portioning of the mixture is almost dust-free and/or loss-free.

In particular, it is preferred if the system 32 according to the invention is essentially set up on a level subsurface, in particular on the floor B. This contributes to an optimization and/or reduction of the required maximum overall height of the system 32 and at the same time allows a compact and/or cost-effective design of the system 32 according to the invention.

In addition, the present invention relates to a method for producing a mix, preferably a dry mix of building materials, in particular a plaster mortar, preferably made of pourable and/or particulate materials 2, the principles described above being carried out alone or in combination.

The method according to the invention is described below as an example based on its implementation on the device 1 or plant 32 according to the invention.

The method according to the invention is preferably designed for the batchwise and/or discontinuous production of mixed materials, preferably a building material mixture, in particular a plastering mortar. Alternatively, however, a continuous production of mixed goods is also possible using the method according to the invention.

In particular, operation of the system according to the invention in batches is provided, with the batch size and the number of batches being entered via an operating device of the control device. In particular, different recipes for finished goods items can be stored in the control device. In particular, it is stored for each finished goods item which recipe is to be run with the finished goods item.

The materials 2 to be mixed are stored and/or accommodated in at least one storage device 35 before being fed to the mixing container 3 .

Different materials 2 are preferably received and/or stored separately from one another in a plurality of storage devices 35 before they are fed to the mixing container 3 by the charging device 33 .

In particular, the different materials 2 are received and/or stored separately from one another in flexible storage containers 35A and/or rigid storage containers 35B and/or weighing containers 35C before being fed to the mixing container 3 by the loading device 33 .

Before the materials 2 are loaded or supplied to the mixing container 3 of the mixing device 1, the shut-off elements 9E of the inlet means 9 are first opened and the closure element 10B of the outlet means 10 is closed.

In particular, the materials 2 are conveyed via at least one loading device 33 from the storage device 35A, 35B, 35C to the mixing container 3 of the mixing device 1 .

Preferably, the materials 2 that are received and/or stored separately from one another in corresponding storage devices 35A, 35B, 35C are each fed via an assigned loading device 33 from the assigned storage devices 35A to 35C to the mixing container 3 of the mixing device 1 supplied, preferably so that the different materials 2 preferably enter the mixing container 3 at the conveying outlet of the corresponding charging device 33 via associated inlet means 9 .

A first control device is preferably provided for metered loading of the mixing container 3 from the two flexible storage devices 35A. In particular, a simultaneous supply of the materials 2 from the storage devices 35A to the mixing container 3 is possible. However, the feeding can also take place one after the other. For dosing the materials 2, a setpoint is specified via the first control device. With the start of dosing, the materials 2 are discharged from the storage containers 35A, with an actual value in relation to the weight of the material 2 discharged being recorded, in particular by means of corresponding weighing means of the storage devices 35A. If - taking into account a certain tolerance - the metered actual value corresponds to the specified target value, metering is ended.

A second control device is preferably provided for metered loading of the mixing container 3 from the weighing container 35C and/or the small scale. In the dosing step, a target value is set for the small scale and/or the weighing container 35C, with the preferably manual feeding of the materials to the weighing container 35C, the current actual value, starting from the previously specified target value, tending to zero. After reaching the specified target value, the materials are withdrawn from the weigh bin 35C and fed to the mixing bin 3.

In particular, the materials 2 are introduced into the mixing container 3 of the mixing device 1 along the filling direction E, which is preferably predetermined by gravity, via the inlet means 9 into the mixing container 3 .

The materials 2 introduced into the mixing container 3 in the inlet direction E preferably enter the lower container part 5 of the mixing container 3 essentially tangentially in the working direction A or opposite to the working direction A of the mixing tools 8 .

The mixing tools 8 are driven in the working direction A with the rotation of the mixing shaft 7 in order to mix the materials 2 into mixed goods within the mixing container 3 .

The materials 2 are particularly preferably mixed within the mixing container 3 at a speed of the mixing shaft 7 of less than 80 l/min, preferably less than 70 l/min, particularly preferably less than 60 l/min and/or more than 5 l/min. min, preferably more than 10 l/min, particularly preferably more than 15 l/min.

After the complete loading of the mixing container 3 with materials 2, the inlet means 9 is closed by the shut-off element 9E.

The weight of the materials 2 entering or located in the mixing container 3 is preferably determined continuously via one or more weighing means and preferably transmitted as an electronic signal to a corresponding display device and/or central control device. If, particularly in the case of batchwise operation, a target value or a target weight is reached, the further feeding of materials 2 into the mixing container 3 is stopped, in particular by deactivating the corresponding charging device(s) 33 and/or closing the shut-off elements 9E, in particular by means of the central control device.

After the materials 2 have been completely mixed to form mixed goods inside the mixing container 3 , the mixed materials 2 or mixed goods are discharged or discharged from the mixing container 3 via the outlet means 10 of the mixing container 3 .

In particular, the closure element 10B of the outlet means 10 is opened for this purpose, so that the mixed material 2 emerges from the mixing container 3 in the form of a mixed material flow G via the outlet opening 10A of the outlet means 10 .

If necessary, the mixing shaft 7 is stopped after the materials 2 have been completely mixed, so that further processing or conveyance of the materials 2 by the mixing tools 8 is prevented.

Alternatively, however, it can also be provided that the mixing shaft 7 remains driven when the closure element 10B is open - in particular at a reduced speed - so that the materials 2 can be conveyed by means of the mixing tools 8 driven in the working direction A, in particular along opposite axial conveying directions X ₁ and X ₂ to the Outlet opening 10A of the outlet means 10 are promoted.

In particular, the mixed materials 2 preferably exit the mixing container 3 in the form of a mixed material flow G via the outlet opening 10A of the outlet means 10 in an outlet direction essentially predetermined by gravity.

Preferably, the flow of mixed material G emerging from the lower container part 5 through the outlet opening 10A of the outlet means 10 is guided or directed within the conical outlet element C with a discharge cross section Q that decreases in the direction of the flow of mixed material G.

In particular, the mixed material flow G within the outlet element 10C is subjected to compressed air, in particular loosened up, preferably with the compressed air being introduced via at least one opening 10F in the outlet element 10C via a corresponding compressed air nozzle.

In particular, the flow of mixed material G is regulated via the feed device 26, preferably a wing sluice, in such a way that the flow of mixed material G is discharged evenly in the form of successive portions of mixed material from the outlet means 10 of the lower part 5 of the container.

After the materials 2 have exited the outlet means 10, the portions of mixed material that have been discharged uniformly one after the other are fed to corresponding—preferably cup-shaped—transport containers of the discharge device 34.

The portions of mixed material are preferably carried away or removed from the mixing container 3 by means of the removal device 34 in a first conveying section along a horizontal conveying direction.

Following this, the mixed material portions are conveyed upwards in a second conveying section along a vertical conveying direction in the direction of a maximum conveying height by means of the discharge device 34 .

Finally, the mixed material portions are conveyed by means of the discharge device 34 in a third conveying section along a horizontal conveying direction at the maximum conveying height.

Subsequently, starting from the discharge end of the third conveying section of the discharge device 34, the mixed material portions are taken up, in particular temporarily stored, in at least one mixed material container 35D.

Particularly preferably, two mixing material containers 35D are supplied or filled with mixing material, in particular at the same time, by means of the discharge device 34 .

In particular, it is preferable for the mixed goods to be conveyed away in portions, in particular in bags, via at least one filling device 41, in particular a bagging device, preferably with the filling device 41 being supplied with mixed goods via at least one mixing material container 35D. For portion-by-portion feeding, the filling device 41 has at least one weighing means, in particular a load cell, with the further feed of mixed material being interrupted after a target weight has been reached and the filling of another bag of mixed material being initiated.

The mixed materials are particularly preferably conveyed away simultaneously via a plurality of, preferably two, filling devices 41, preferably with each filling device 41 being supplied with mixed materials via an associated mixing material container 35D.

The aspects described above can preferably be combined with one another. <b>List of reference characters:</b> 1 mixing device 17 first axial end 2 materials 18 second axial end 3 mixing tank 19 first end wall 4 container top 20 second end wall 5 container base 21 stripping device 6 floor inner surface 22 first storage facility 7 mixed shaft 23 second storage facility 8th blending tool 24 drive device 8A mixed body 25 gear mechanism 8AA mixed body area 26 feeder 8B mixing arm 27 filter device 9 admission agent 28 filter 9A inlet section 29 cleaning unit 9B loading opening 30 support element 9C filling hole 31 mixing tank flap 9D fasteners 32 factory 9E shut-off element 33 loading device 10 outlet agent 34 discharge device 10A exhaust port 35 storage facility 10B closure element 35A flexible storage container 10C outlet element 35B rigid storage container 10CA filling opening 35C weigh bucket 10D connection section 35D mix hopper 10E lanyard 36 supporting structure 10F breakthrough 37 access stage 11 first leg 38 Floor space 12 second leg 39 breakthrough 13 inner thigh surface (first thigh) 40 stair element 41 filling device 14 Inner thigh surface (second thigh) A working direction 15 mixing tank lid B floor 16 lid inner surface C side clearance E filling direction G mix flow H height offset I inner space K circular path L longitudinal axis M mixed axis Q discharge cross section S pivot axis T tangent V vertical plane W angle of attack X ₁ first axial conveying direction X ₂ second axial conveying direction

Claims (14)

1. Mixing device (1) for mixing particulate materials (2), preferably for producing a dry building material mixture, in particular a plaster mortar, in discontinuous and/or batchwise operation,

   with a preferably one-piece mixing container (3) for receiving the materials (2),

   wherein the mixing container (3) has an upper container upper part (4) with at least one inlet means (9) for introducing the materials (2) into the mixing container (3) along a filling direction (E) which is preferably predetermined by gravity, and a lower container part (5) with at least one outlet means (10) for discharging mixed materials from the mixing container (3),

   wherein the lower container part (5) is substantially arcuate in a sectional plane extending orthogonally to a longitudinal axis (L) of the mixing container (3), and

   with a mixing shaft (7) which is arranged rotatably about a mixing axis (M) within the mixing container (3),

   wherein mixing tools (8), which are preferably axially spaced apart, are arranged on the mixing shaft (7) and are drivable within the mixing container (3) with the rotation of the mixing shaft (7) about the mixing axis (M) in a working direction (A) for mixing the materials (2) to form mixed products,

   wherein the upper container part (4), in a sectional plane extending orthogonally to the longitudinal axis (L) of the mixing container (3), is substantially U-shaped with two legs (11, 12) directed towards the lower container part (5), wherein, within the mixing container (3), the inner leg surfaces (13, 14) of the legs (11, 12) and the inner bottom surface (6) of the lower container part (5) merge substantially tangentially into one another,

   wherein the upper container part (4) comprises two or more inlet means (9) for introducing the materials (2) into the mixing container (3), and

   wherein the inlet means (9) are each arranged in the region of an axial end (17, 18) of the mixing vessel (3),

   characterized in

   that the outlet means (10) is arranged in the region of a center point of the lower container part (5), and

   that the mixing tools (8) of the mixing shaft (7) are designed and/or arranged within the mixing container (3) in such a way that the materials (2) can be conveyed within the mixing container (3) in opposite axial conveying directions (X₁, X₂), it being possible for the materials (2) to be conveyed, starting from the axial ends (17, 18) of the mixing container (3), towards the outlet means (10) of the mixing container (3).
2. Mixing device according to claim 1, characterized in that the mixing container (3) and/or the mixing shaft (7), in particular in the operating and/or application state, are/is arranged and/or aligned at least substantially horizontally and/or horizontally, in particular with respect to the longitudinal axis (L) of the mixing container (3) and/or the mixing axis (M) of the mixing shaft (7), and/or

   in that the mixing container (3) is elongate and/or rectangular in a sectional plane running parallel to the longitudinal axis (L) of the mixing container (3), and/or

   in that the mixing shaft (7) is arranged and/or aligned at least substantially concentrically with respect to a central axis and/or axis of rotation of the lower container part (5).
3. Mixing device according to claim 1 or 2, characterized in that the inlet means (9) are arranged on a substantially flat and/or rectangular mixing vessel cover (15) of the mixing container (3).
4. Mixing device according to any one of the preceding claims, characterized in that each mixing tool (8) comprises at least one mixing body (8A) for processing and/or mixing and/or ploughing through the materials (2) within the mixing container (3) and at least one mixing arm (8B), preferably projecting radially from the mixing shaft (7), for attaching the mixing body (8A) to the mixing shaft (7). s
5. Mixing device according to claim 4, characterized in that the mixing arm (8B) of the mixing tool (8) is substantially circular in cross-section and/or

   in that the mixing body (8A) of the mixing tool (8) is of substantially paddle-like design and/or

   in that the mixing body (8A) has a substantially planar and/or flat mixing body surface (8AA) for processing and/or mixing and/or ploughing through the materials (2) within the mixing container (3) to form mixed materials.
6. Mixing device according to one of the preceding claims, characterized in that the mixing container (3) is closed and/or closable at its axial ends (17, 18) by two preferably discshaped end walls (19, 20).
7. Mixing device according to one of the preceding claims, characterized in that the outlet means (10) comprises at least one closure element (10B), in particular a pivotable closure flap, for opening and/or closing the lower container part (5).
8. Mixing device according to one of the preceding claims, characterized in that the outlet means (10), preferably the outlet element (10C), has at least one feed device (26), in particular a wing sluice, for releasing and/or shutting off and/or metering a flow (G) of mixed material emerging from the mixing container (3).
9. Use of a mixing device (1) for mixing particulate materials (2) according to one of the preceding claims for producing a mixed material, preferably a dry building material mixture, in particular a plaster mortar.
10. Plant (32) for producing mixed materials, preferably dry building material mixtures, in particular plaster mortar, from particulate materials (2) with

    at least one charging device (33), preferably a continuous conveying device, in particular a screw conveyor, for conveying the materials (2),

    a mixing device (1) with a mixing container (3) for mixing the materials (2) into mixed goods within the mixing container (3), and

    a discharge device (34), preferably a continuous conveying device, for conveying the mixed materials away from the mixing container (3) of the mixing device (1),

    characterized in

    that the mixing device (1) is formed according to any one of claims 1 to 8.
11. Plant according to claim 10, characterized in that the plant (32) comprises a plurality of feeding means (33) for feeding the materials (2) to the mixing container (3) of the mixing device (1).
12. Plant according to claim 10 or 11, characterized in that each of the storage means (35A - 35C) is associated with a feeding means (33) for separately feeding the different materials (2) from the storage means (35A - 35C) to the mixing container (3) of the mixing device (1).
13. Plant according to any one of claims 10 to 12, characterized in that the plant (32) comprises a supporting structure (36) with a walk-on access platform (37) for access and/or operation of the mixing device (1), preferably wherein a base (38) of the access platform (37) is arranged at the level of the upper region of the mixing device (1), preferably of the mixing container lid (15) of the mixing container (3).
14. Method for producing a mixed material, preferably a dry building material mixture, in particular plaster mortar, from particulate materials (2) in a mixing device (1) according to any one of claims 1 to 8,

    wherein the materials (2) are introduced into the mixing container (3) of the mixing device (1) along a filling direction (E), which is preferably predetermined by gravity, via the inlet means (9) of the mixing container (3) and mixed materials (2) and/or mixed goods are discharged from the mixing container (3) via the outlet means (10) of the mixing container (3),

    wherein the mixing shaft (7) is rotatably driven about a mixing axis (M) within the mixing container (3), and

    wherein, for mixing the materials (2) to form mixed products, mixing tools (8) arranged preferably axially spaced apart on the mixing shaft (7) are driven within the mixing container (3) with the rotation of the mixing shaft (7) about the mixing axis (M) in a working direction (A),

    wherein the materials (2) are conveyed within the mixing container (3) in opposite axial conveying directions (X₁, X₂), wherein the materials (2) are conveyed starting from the axial ends (17, 18) of the mixing container (3) towards the outlet means (10) of the mixing container (3).

Images